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CVE-2021-21973: VMware vCenter Server and Cloud Foundation Server Side Request Forgery (SSRF) Vulnerability

criticalknown exploitedpublic exploitCVE-2021-21973
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
VMware vCenter Server and Cloud Foundation Server contain a SSRF vulnerability due to improper validation of URLs in a vCenter Server plugin. This allows for information disclosure.

CSIRTS triage

vendor: VMwareproduct: vCenter ServerServer-side request forgeryInformation disclosure
What
VMware vCenter Server contains a SSRF vulnerability due to improper validation of URLs in a vCenter Server plugin.
Who is affected
Users of VMware vCenter Server and Cloud Foundation who have not updated their systems.
Urgency
Remediation is critical due to active exploitation and the potential for information disclosure.
Action
Update to the latest version of vCenter Server.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-03-07
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-21973

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-21973coverage & exploitation statusNVD · CVE.org

Recent advisories for VMware vCenter Server

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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